History 226 Agriculture 160 Economics 119 Agricultural economics 113 Organic farming 111 Farm management 85 Mathematics 84 Literature 83 History and criticism 79 India 73 Management 68 Labor force-- Labor economics 59 Agricultural engineering 58 Philosophy 58 Literary form 54 Rural development 52 LPM 49 Novel 49 Management Information Systems 45 Criticism 43 Farming 41 Research 39 Arms control 38 Social conditions 38 Extension 37 Farm Management 37 Politics and government 37 Biography 35 English fiction 35 Methodology 35